• 한국수소및신에너지학회논문집
• /
• 제32권6호
• /
• pp.431-441
• /
• 2021

UAE is first country in Middle East to approve UN Paris Climate Agreement. Ministry of Climate Change and Environment of UAE announced National Climate Change Plan for carbon reduction to replace 24% by clean energy. Dubai open its first hydrogen station in UAE and Middle East in 2017, and Abu Dhabi planed to open second hydrogen station in 2019 but not realized. Korean government announced hydrogen economy roadmap in 2019 and various hydrogen cooperation are realized between UAE, Korea, Germany, USA, and Japan. MOU between Ministry of State of UAE and Ministry of Land, Infrastructure and Transport of Korea in 2019 for the cooperation of hydrogen city. This study propose strategies for the 'Hydrogen Based Public Transport in UAE' by the support of Korea government considering various stakeholder.

• International Journal of Automotive Technology
• /
• 제2권2호
• /
• pp.39-45
• /
• 2001

Hydrogen is seen as one of the important energy vectors of the next century. Hydrogen as a renewable energy source, provides the potential for a sustainable development particularly in the transportation sector. Hydrogen driven vehicles reduce both local as well as global emissions. The laboratory of transporttechnology (University of Gent) converted a GM/Crusader V-8 engine for hydrogen use. Once the engine is optimised, it will be built in a low-floor midsize hydrogen city bus for public demonstration. For a complete control of the combustion process and to increase the resistance to backfire (explosion of the air-fuel mixture in the inlet manifold), a sequential timed multipoint injection of hydrogen and an electronic management system is chosen. The results as a function of the engine parameters (ignition timing. injection timing and duration, injection pressure) we given. Special focus is given to topics related to the use of hydrogen as a fuel: ignition characteristics (importance of electrode distance), quality of the lubricating oil (crankcase gases with high contents of hydrogen), oxygen sensors (very lean operating conditions), noise reduction (configuration and length of inlet pipes). The advantages and disadvantages of a power regulation only by the air to fuel ratio (as for diesel engines) against a throttle regulation (normal gasoline or gas regulation) are examined. Finally the goals of the development of the engine are reached: power output of 90 kW, torque of 300 Nm, extremely low emission levels and backfire-safe operation.

• 한국수소및신에너지학회논문집
• /
• 제26권6호
• /
• pp.645-651
• /
• 2015

Numerical study on human thermal comfort in a low floor bus has been conducted. Human thermal comfort in a bus depends mainly on air temperature, air velocity, mean radiant temperature, humidity, and direct solar flux, as well as the level of activity and thermal properties of clothing. The paper presents the velocity and temperature distribution, Predicted Mean Vote (PMV) and Predicted Percentage of Dissatisfied (PPD) indices for the driver and passengers.

• Composites Research
• /
• 제35권6호
• /
• pp.425-430
• /
• 2022

수소가스용 압력용기의 안전성 평가를 위해 다양한 내구성 시험이 요구된다. 고온 정압 시험은 고압(875 bar) 하에 고온(85℃ 이상)에서 장시간(1,000시간) 유지하여 수소 용기의 내구성을 시험하는 방법이며 승용차용 용기에 한정되어 있다. 하지만 대용량 수소버스용 용기와 관련된 고온 정압 시험의 국제 기준은 논의 초기 단계이며, 시험의 효율성 및 신뢰성 측면에서 가속시험 기준 제시 등의 현실적 보완이 필요하다. 본 연구에서는 수소버스용 내압용기의 고온 정압 시험 기준을 정립하기 위해 열적환경에 노출된 내압용기 복합재의 기계적 물성평가를 진행하였다. 복합재의 인장강도는 수지의 유리전이온도에 가까워질수록 수지의 열화로 인해 강도가 감소한다. 또한 장시간 유지 시 수지의 후경화로 인해 인장강도의 재상승을 확인할 수 있었다. 따라서 대용량 수소버스용 압력용기의 고온 정압 시험은 탄소섬유 복합재의 에폭시 수지 물성을 바탕으로 시험 조건을 설정해야 한다.

• 한국수소및신에너지학회논문집
• /
• 제25권3호
• /
• pp.264-270
• /
• 2014

Fuel cell technology is the most representative area of alternative energy field on vehicle industry according to the limitation of petroleum resources. In recent years, the technology of fuel cell vehicles has made rapid progress, Hyundai Motor Company (HMC) reached to mass production of the Tucson ix hydrogen fuel cell vehicles first in the world. In addition, HMC is accelerating the development of hydrogen fuel cell buses, which have a number of advantages for hydrogen infrastructure and mass transport personnel. In this study, we examined potential of the commercialization through the demonstration of hydrogen fuel cell buses. As a result, we identified that the mass-production possibility of FCB has high potential and HMC's technology will lead to fuel cell bus industry.

• 한국가스학회지
• /
• 제21권2호
• /
• pp.20-25
• /
• 2017

압축 천연가스에 수소를 혼합한 HCNG 연료를 사용하는 HCNG 버스에 대해 WHVC 차량시험 결과를 토대로 연료 경제성 및 $CO_2$ 배출특성을 분석하였다. 동급 CNG 버스 및 디젤버스 시험결과와 비교하여 HCNG 버스의 연비 개선효과와 $CO_2$ 저감효과를 고찰하였다. $CO_2$ 배출특성은 탄소배출계수에 따른 연료효과와 연비에 의한 효과로 분석하였다. 분석결과 HCNG 버스는 CNG 버스 보다 연비는 11.5% 개선되었고 디젤버스와는 동등수준을 보이는 것으로 나타났다. 또한 $CO_2$ 배출 특성으로 HCNG 버스는 CNG 버스에 비해 20.4% 개선효과가 있고 디젤버스에 비해 34.5% 향상되는 것으로 분석되었다. 이산화탄소 배출특성은 연료성분에 따른 탄소배출계수와 엔진성능에 따른 연비에 영향을 받는 것으로 귀결되었다.

• 한국수소및신에너지학회논문집
• /
• 제34권3호
• /
• pp.246-255
• /
• 2023

Due to lack of hydrogen charging stations and hydrogen supply compared to the supply of hydrogen vehicles, social phenomena such as 2-hour queues and restrictions on charging capacity are occurring, which negatively affects the spread of hydrogen vehicles. In order to resolve these problems, it is essential to have a strategic operation of the hydrogen charging stations. To establish operational strategies, it is necessary to derive customer demand patterns and characteristics through the analysis of sales data. This study derived the demand patterns and characteristics of customers visiting hydrogen charging stations through data analysis from various perspectives, such as charging volume, charging speed, number of visits, and correlation with external factors, based on the hydrogen sales data of off-site hydrogen charging stations located in domestic residential areas.

• 한국수소및신에너지학회논문집
• /
• 제18권1호
• /
• pp.60-66
• /
• 2007

In terms of the vehicle efficiency, a fuel cell hybrid system has advantages compared to a conventional internal combustion engine and a fuel cell alone-powered system. The efficiency of the fuel cell hybrid vehicle mainly depends on the maximum power of the fuel cell and therefore it is important to decide the design value of the fuel cell maximum power. In this paper, to estimate the performance of the fuel cell hybrid mini-bus in the design phase the simulator based on the models for the fuel cell stack, the electric battery, the fuel cell balance of plant, the controller, and the vehicle itself is proposed. Additionally, the hybrid mini-bus efficiencies with several different fuel cell powers are simulated for a city driving schedule and are compared on another. Consequently, the proposed simulation scheme is useful to determine the best design value of the fuel cell hybrid vehicles.

• 한국수소및신에너지학회논문집
• /
• 제34권2호
• /
• pp.91-99
• /
• 2023

Participation in power trading using surplus power is considered a business model active in the domestic energy trade market, but it is limited only if the legal requirements according to the type, capacity, and use of the facilities to be applied for are satisfied. The hydrogen residential demonstration model presented in this paper includes solar power, energy storage system (ESS), fuel cell, and water electrolysis facilities in electrical facilities for private use with low-voltage power receiving system. The concept of operations strategy for this model focuses on securing the energy self-sufficiency ratio of the entire system, securing economic feasibility through the optimal operation module installed in the energy management system (EMS), and securing the stability of the internal power balancing issue during the stand-alone mode. An electric facility configuration method of a hydrogen residential complex demonstrated to achieve this operational goal has a structure in which individual energy sources are electrically connected to the main bus, and ESS is also directly connected to the main bus instead of a renewable connection type to perform charging/discharging operation for energy balancing management in the complex. If surplus power exists after scheduling, participation in power trading through reverse transmission parallel operation can be considered to solve the energy balancing problem and ensure profitability. Consequentially, this paper reviews the legal regulations on participation in electric power trading using surplus power from hydrogen residential models that can produce and consume power, gas, and thermal energy including hybrid distributed power sources, and suggests action plans.

• 한국ITS학회 논문지
• /
• 제22권6호
• /
• pp.196-207
• /
• 2023

기후위기 대응을 위한 대책으로 버스도 전기, 수소 버스로 우선 전환되고 있다. 지자체는 신규 투입, 전환되는 전기, 수소 버스 배정의 우선순위를 탄소배출량에 따라 판단할 필요가 있으며 그 방법으로 특정 구간에 무공해버스 운행만 허용하는 LEBZ 도입을 고려할 수 있다. LEBZ를 도입하기 위해서는 도입 전후 탄소배출량 절감 효과를 비교할 필요가 있으나 LEBZ도입 방안과 도입 시 효과를 분석하는 연구는 부족한 상황이다. 본 논문에서는 버스정보시스템 데이터를 활용하여 제주특별자치도를 대상으로 버스우선차로에 LEBZ 도입 시 효과를 산출하고 비교하였다. 분석 시나리오를 총 5개로 구분하여 시나리오1부터 4까지는 LEBZ 도입, 시나리오5는 LEBZ를 지정하지 않고 일부 차량만 전기, 수소 버스로 전환하는 경우로 구성하였고, 버스정보시스템 자료를 이용하여 탄소배출량을 비교한 결과 LEBZ를 도입한 경우가 km당 감축량이 최대 0.097t, 그렇지 않은 경우가 0.022t으로 LEBZ 도입은 높은 효율을 보임을 확인하였다. 본 논문은 제안한 버스정보시스템 데이터를 활용한 탄소배출량 산출 및 LEBZ 도입에 따른 효과 비교를 통해 각 지자체에서도 전기, 수소 버스 투입 시 의사 결정을 보다 합리적으로 할수 있는 방법론 제시에 의의를 두었다.